To check the virtualizatio issues easily first expand the package on to the local machine.If the package is not working on the local machine too then may be some files/registtries are missing.If it working on the local machine you can try different trouble shooting methods which we will apply for the local package.But, all these methods you have to apply inside virtual bubble.

Procmon is a great application and it's very helpful to troubleshoot some apps but for Virutalization troubleshooting the best App is SpyStudio. It's more specific and you can see the user mode calls.

ThinApp sandbox intercepts user-mode calls, that's why you can see only some errors with Procmon but you can't see the virtualized registry keys and files since they are intercepted by the sandbox and Procmon never see these calls.

In addition to this, you are able to see user mode Com errors, exceptions, windows creation and a lot more user-mode staff which Procmon cannot see. Registry keys and file system is organized as a tree which helps a lot to see errors.